A prime coat is given to steel work with
An oxide of iron paint
A mixture of white lead and lead paint
A special paint
Cement paint
Correct Answer :
B. A mixture of white lead and lead paint
Related Questions
Soundness test of cement determines
Quality of free lime
Ultimate strength
Durability
Initial setting
The nominal size of the modular brick is
190 mm × 90 mm × 80 mm
190 mm × 190 mm × 90 mm
200 mm × 100 mm × 100 mm
200 mm × 200 mm × 100 mm
Minimum of 40% of iron, is available in
Magnetite
Red haematite
Limonite
Black band
The slenderness ratio for masonry walls should not be more than
10
20
30
40
A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
Slate
Plank
Board
Strip
Good quality cement contains higher percentage of
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
Pick up the correct statement from the following:
Hornblende mineral is brittle
Muscovite is also known as white mica and potash mica
Biotite is also known as black-mica
All the above
The usual percentages of clay and metal in cermet are:
50%, 50%
60%, 40%
70%, 30%
80%, 20%
Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below:
Both A and R is true and R is correct explanation of A
Both A and R is true and R is not a correct explanation of A
A is true but R is false
A is false but R is true
Pick up the correct statement from the following:
The baked earth is called terra-cotta
The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware
The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware
All the above
Pick up the correct statement from the following:
Rusting is caused due to combined action of air, moisture and carbon dioxide
During rusting, first ferrous bicarbonates are formed
On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
All the above
Durability of building stone is affected by its
Chemical composition
Texture
Resistance to atmosphere
All the above
The most common admixture which is used to accelerate the initial set of concrete is
Gypsum
Calcium chloride
Calcium carbonate
None of the above
The portion of a brick cut to form angles other than right angles in plan, is known as
Queen closer
King closer
Closer
Squint brick
Stones used for rubble masonry must be
Soft
Hard
Light
Heavy
The size of modular bricks, is
10 × 10 × 9 cm
19 × 9 × 9 cm
22.5 × 10 × 8.5 cm
22.5 × 8.0 × 9 cm
For light and ornamental casting, the most unsuitable pig iron, is
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick
20 %
15 %
10 %
None of these
Which one of the following is an air binding material?
Gypsum
Acid-resistant cement
Quick lime
All of these
Kaolin is chemically classified as
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
For melting one tonne of cast iron
700 m3 air is required
20 kg limestone is required
One quintal coke is required
All the above
Cast iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
A volatile substance added to a paint to make its application easy and smooth, is known as
Base
Solvent
Vehicle
None to these
In the cement the compound quickest to react with water, is
Tri-calcium aluminate
Tetra-calcium alumino-ferrite
Tri-calcium silicate
Di-calcium silicate
For a good building stone, its specific gravity should the greater than
1.5
1.7
2.2
2.7
As per IS specifications, the maximum final setting time for ordinary Portland cement should be
30 minutes
1 hour
6 hours
10 hours
Refractory bricks are used for
Retaining walls
Columns
Piers
Combustion chambers
The plastics made from cellulose resin
Are as clear as glass
Are tough and strong
Possess excellent electrical properties
All the above
Seasoning of timber is essential to remove
Knots from timber
Sap from timber
Twisted fibre from timber
Roughness of timber